This is the best low-priced concealer palette out there.
I use it under my eyes and it banishes circles instantly. You might have to blend a couple of the shades together to find your perfect match (the palettes come in Fair, Medium, and Dark- each with 3 skin tones). After applying "my match" under my eyes, I let it sit for a minute before creating a "v" of pink. The pink overlay is what I find to help the most on dark circles.
The yellow is great to use under foundation, on the sides of your nose. Women naturally develop redness in that area and the yellow works great to counteract that.
I don't use the green shade.